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June 24, 1930- H N 1,768,320

HIGH PRESSURE LOCOMOTIVE Filed Oct. 27, 1928 3 Sheets-Sheet 1 .Z'nrerrfaf': g

0170 17 fidrfma w June 24, 1930. HARTMANN 1,768,320

HIGH PRES SURE LOCOMOTIVE Filed Oct- 8 a Sheets-Sheeli 2 Fig.3.

June 24, 1930. O A N 1,768,320

HIGH PRES SURE LOCOMOTIVE Filed 001;. 2'7, 1928 3 Sheets-Sheet 3 Fig.4. 2

.lm enfar Patented June 24, 1930 UNITED STATES PATENT OFFICE OTTO H. HARTMANN, OI CASSEL-WILHELMSHOHE, GERMANY, ASSIGNOR '10 SCHMIDT- SCHE -HEISSDAMPF-GESELLSCHAFT M. B. H., OF CASSEL-WILHELMSHOHE, GER- MANY, A. CORPORATION OF GERMANY HIGH-PRESSURE LOCOMOTIVE Application filed October 27, 1928, Serial No. 315,558, and in Germany June 15, 1928.

In two-pressure locomotives in which a considerable part of the total steam is generated in the low-pressure boiler, interstage superheating can be conveniently effected by mixing the exhaust from the high-pressure stage of the engine with superheated lowpressure steam.

If, however, the high-pressure locomotive is so constructed that the steam needed to develop the power of the engine is generated almost entirely in the high-pressure boiler while the smoke-tube boiler serves principally as a feed-water heater and at most generates only a small fraction of the total steam, considerable difiiculties are experienced in connection with the interstage superheatin Such difficulties, moreover, cannot be overcome by the application of a superheater disposed in the flue gases, the simple construction of which renders it in other respects desirable, because in such a superheater the oil contained in the exhaust steam would burn on to the tubes.

On the other hand, superheating by saturated steamfrom the high-pressure boiler does not meet the requirements of the case,

because the required high degree of superheat cannot be attained.

Such a temperature can be reached, however, if the high-pressure steam is highly superheated before its application as heating steam in the interstage superheater, but it is diflicult to arrange superheaters in the limited space available in the locomotive so that the necessary heat can be imparted to the high-pressure steam before admission to the interstage superheater and againafter leaving the latter and before admission to the high-pressure stage of the engine.

The 01)]80t of the present invention is to provide a solution of the above problem for a high-pressure locomotive with a smoketube feed-water heater serving in some cases for the generation of low-pressure steam, the heater lying in the flue of the highpre'ssure boiler containing or constituting the fire box. g

According to the resent invention, the exhaust steam from t e high-pressure stage of the engine, in some cases in conjunction with the low-pressure steam generated in the smoke-tube feed-water heater, is highly superheated in an interstage superheater by means of superheated high-pressure steam from a superheater which lies wholly or in part in a flue leading from the high-pressure fire box to the smoke-tube feed-water heater.

In order to avoid burning the superheater tubes, specially with high rates of fuel consumption per unit area .of the grate, a certain number of the water tubes of the highpressure boiler are so arranged in the flue that the products of combustion from the furnace must pass between them before reaching the superheater.

According'to a preferred form of the invention, in addition to the superheater for the high-pressure steam going to the interstage superheater, a second superheater is' igure 1 shows a longitudinal section through a locomotive fitted with one constructional form of the new arrangement. of

interstage reheating;

Figure 2 is a section on the line',IIII of Figure 1;

Fi re 3 is a cross-section on the broken line IIIII of Figure 1.; while Figure 4 shows a longitudinal section of the locomotive with a modified arrangement of the interstage superheating.

For the present invention it is immaterial Whether the high-pressure steam is geners ated by direct or indirect heating; in the illustrative forms shown in the drawings, the steam-and-water drum of the high-. pressure boiler is heated according to the indirect method.

In the form of the invention shown in Figures 1 to 3, the water-tube fire box, A, and the smoke-tube boiler, B, are connected by a flue, C.

The water tubes, 1, of the fire box are connected at their lower ends to water headers, 2, and at their upper ends to intermediate headers, 3, the steam from the latter passing into the heating elements which lie in the high-pressure boiler drum, 4, while the condensate formed in the heating elements is led back through downcomers into the lower water headers, 2. This kind of indirect steam generation by means of a heat carrier circulating in a closed tube system is well known and does not therefore require further description here.

To the intermediate headers, 3, water tubes, 5, serving as walls for the flue, C, are also connected, the lower ends of these tubes being connected to a water header, 6. Besides the tubes, 5, serving as Walls for the flue, other water tubes, 8, are provided which likewise extend from the header, 6, to the intermediate headers and are so formed that they are distributed over the cross-section of the flue, C. a

In Figure 2 are shown the heating elements, 9, lying in the high-pressure drum, the steam pipes, 10, leading from the intermediate headers, 3, to the heating elements, 9, and the condensate pipes, 11, leading from the heating elements to the header, 6. In

addition downcomers, 12. are provided which connect the intermediate headers, 3, to the water header, 6. I

In the part of the flue, C, adjoining the smoke-tube boiler, B, are arranged two highpressure superheaters, 13 and 14. In this part of the flue, C, there are only transverse connecting tubes, 15, between the intermediate containers, 3, but no other water tubes, the transverse tubes, 15, serving to protect the drum, 4, from the action of the hot gases.

The high-pressure steam generated in the drum, 4, is led through the pipe, 16, provided with ashut-ofi valve to the superheater, 13, from which the pipe, 18, leads the superheated steam to the interstage superheater, 19, arranged in the upper part of the smoke box. After traversing the heating elements, 20, of the interstage superheater, 19, the steam is led back through the pipe, 21, to the superheater, 14. Here the high-pressure steam is re-superheated to a high temperature and passes through the pipe, 22, to the high-pressure cylinders, 23, of the locomotive. The exhaust steam from the high-pressure cylinders flows through as a feed-water heater for the high-pressure drum, 4, any low-pressure steam generated in the boiler, B, being mixed in the interstage-superheater, 19, with the exhaust from the high-pressure cylinders.

The interstagesteam, highly heated by the highly-superheated high-pressure steam, passes through the pipe, 28, to the lowpressure cylinders, 29, the exhaust from which is led in the usual way to the blast pipe, 30.

Steam for the auxiliaries can be taken through the pipe, 31, connectedto the interstage superheater, 19.

The locomotive shown in longitudinal section in Fig. 4, is structurally similar as regards its main features to that shown in Figures 1 to 3, corresponding parts being indicated by the same reference symbols.

As regards the superheating arrangements, however, the essential difference lies in the fact that the two superheaters, 32 and 33, in which the high-pressure steam is highly superheated first before admission to the heating elements of the interstage superheater and then a second time before admission to the high-pressure stage of the engine, lie in the smoke tubes, 34, of the smoke-tube feed-water heater. The tubes of these superheaters project for a considerable part of their length into the flue, C, so that in this way a sufficient superheating of the high-pressure steam is secured. Those parts of the superheater tubes lying in the flue. C, are protected against burning by the water tubes, 8, which are distributed over the crosssection of the flue, C, as shown in Figure 2.

The high-pressure steam generated in the high-pressure drum, 4, is led through the pipe, 35, provided with a shut-off valveto the super-heater, 32, from which the pipe, 36, leads the superheated steam to the interstage superheater .in the smoke box. The superheated steam traverses the heating elements, 39, of the int-erstage superheater and is then led back through the pipe, 40. to the second superheater, 33, whence after being again superheated, it flows through the pipe, 41, to the high-pressure cylinders, 23, of the engine. The exhaust from the highpressure cylinders flows through the pipe, 42. to the interstage superheater, 38. in order. it may be in conjunction with lowpressure steam comin from the smoke-tube boiler through the pipe, 43, to be in turn highly heated by the superheated high-pressure steam. The superheated interstage steam flows out of the interstage superheater blast pipe, 30.

in' the flue of the high-pressure-boiler,

interstage superheater,

which passes through the pipe, 45, to' the Steam for the auxiliaries can be taken from the pipe,- 46,-connected to the interstage superheater, 38. WhatIclaimis:

1. In a high-pressure locomotive having a multi-stage engine, the combination of a high-pressure boiler constituting the fire box, a smoke-tube-feed-water-heater lying a fire tect said to the heat of the furnace.

gas channel leading from the fire box smoke tubes, a steam heated interstage superheater adapted to superheat the exhaust steam of the high-pressure stage of the engine, a superheater adapted to superhcat the high-pressure-steam and delivering to said a secondsuperheater adapted to -re-superheat the high-pressure steam coming from the heating elements of the interstage superheater, the first mentioned superheater being located to receive heat from the fire gas channel, and water tubes of the high-pressure boiler distributed over the cross section of saidchannel and high-pressurvboiler constituting the fire high-pressure-steam and delivermg to saidarranged in front of thissuperheater as a protection against the radiant heat of the furnace.

2. In a high-pressure locomotive having a multi-stage engine, the combination of; a

box, a 'smoke-tube-feed-water-heaterl 'ng in the flue of the high-pressure boiler, a re gas channel leading from the firebox to the smoke tubes, a steam heated interstage superheater adapted to superheat the exhaust I steam of the high-pressure stage of the eng'ine, a superheater adapted to superheatthe .adapted to resuperheat the high-pressure gas channel leading the engine, a superheater adapted to steam coming from the heating elements of the intersta e superheater, the first men-:

tioned super heat from said fire gas channel, water-tubes of the high-pressure boiler distributed over the cross section ,of said channel and areater being located to receivestage superheater, a second superheater adapted-'to'resuperheat the high-pressuresteam coming from the heatin elements of the intersta'ge superheater, the igh pressure superheater and the resup'erheater being disosed in said fire gas channel, and water tubes of the high pressure boiler extending across the .cross-section of said channel at Boints between the fire-box and said super- In testimonywhereof I have aflixed my.-

signature.

- OTTO H. HARTMANN.

ranged in front of the high-pressure superj heaters as a protection-- against the radiant heatof the furnace, and a conduit adapted to lead steam developed in the smoke-tubefeed-water-heater to the interstage superheater.

" 3. In a high-pressure locomotive having the combination of ,a Y

a multistage engine, high-pressure boiler constituting the fire box, a smoke-tube feed-water-heater lying in theflue of thehighressure boiler, a fire 30111 the fire box to the smoke tubes, a steam heated interstage superheater adapted to superheat the exhaust steam of the high-pressure stage of superpassing heat ,the high-pressure-steam through the heating elements of the interinc 

